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== optica ==na óptica geométrica, o ângulo de incidência é o ângulo entre um raio incidente sobre uma superfície e a linha perpendicular à superfície no ponto de incidência, a chamado normal.
==optics==in geometric optics, the angle of incidence is the angle between a ray incident on a surface and the line perpendicular to the surface at the point of incidence, called the normal.
Last Update: 2016-03-03
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